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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-11173] Difference between querying to mongos and mongod</title>
                <link>https://jira.mongodb.org/browse/SERVER-11173</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We&apos;ve encountered an error migrating to sharded environment.&lt;br/&gt;
It appear there is a difference between querying mongod and mongos as shown below:&lt;br/&gt;
&amp;gt; c = db.test.find(&lt;/p&gt;
{title: &quot;shay&quot;}
&lt;p&gt;,&lt;/p&gt;
{f:0}
&lt;p&gt;).sort(&lt;/p&gt;
{&quot;f&quot;:1}
&lt;p&gt;)&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;525be8c1513f4b195eaa8d00&quot;), &quot;title&quot; : &quot;shay&quot; }

&lt;p&gt;mongos&amp;gt; c = db.test.find(&lt;/p&gt;
{title: &quot;shay&quot;}
&lt;p&gt;,&lt;/p&gt;
{f:0}
&lt;p&gt;).sort(&lt;/p&gt;
{&quot;f&quot;:1}
&lt;p&gt;)&lt;br/&gt;
error: {&lt;br/&gt;
        &quot;$err&quot; : &quot;have to have sort key in projection and removing it&quot;,&lt;br/&gt;
        &quot;code&quot; : 13431&lt;br/&gt;
}&lt;br/&gt;
I understand (now) that it is not possible to exclude a field from a query and sort on it through mongos (that gets the documents without the fields and needs to sort upon them).&lt;br/&gt;
However, as development was done a single mongod, we&apos;ve encountered this error only now when deploying at scale. Now this requires changing our application code accordingly.&lt;br/&gt;
One of the reasons we chose MongoDB was the &quot;scale without affecting existing data or application code&quot; paradigm. Therefore I believe the same behavior of mongos&apos; must be enforced on the shards as well to allow that.&lt;br/&gt;
Thanks&lt;br/&gt;
Shay&lt;/p&gt;</description>
                <environment>RHEL 5.8</environment>
        <key id="94132">SERVER-11173</key>
            <summary>Difference between querying to mongos and mongod</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="sasher@nds.com">Shay Asher</reporter>
                        <labels>
                    </labels>
                <created>Mon, 14 Oct 2013 15:52:18 +0000</created>
                <updated>Wed, 10 Dec 2014 23:06:15 +0000</updated>
                            <resolved>Mon, 14 Oct 2013 15:56:05 +0000</resolved>
                                    <version>2.4.5</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="440520" author="sasher@nds.com" created="Mon, 14 Oct 2013 16:09:33 +0000"  >&lt;p&gt;Thanks.&lt;/p&gt;</comment>
                            <comment id="440508" author="eliot" created="Mon, 14 Oct 2013 15:56:05 +0000"  >&lt;p&gt;Yes, this should be handled automatically, such that the query works in both (not neither.  There is an older ticket &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-10831&quot; title=&quot;Sorting doesn&amp;#39;t work if sort key excluded in projection with a sharded collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-10831&quot;&gt;&lt;del&gt;SERVER-10831&lt;/del&gt;&lt;/a&gt; that we&apos;ll use to track.&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;&amp;gt; c = db.test.find(&lt;/p&gt;
{title: &quot;shay&quot;}
&lt;p&gt;,&lt;/p&gt;
{f:0}
&lt;p&gt;).sort(&lt;/p&gt;
{&quot;f&quot;:1}
&lt;p&gt;)&lt;/p&gt;
{ &quot;_id&quot; : ObjectId(&quot;525be8c1513f4b195eaa8d00&quot;), &quot;title&quot; : &quot;shay&quot; }

&lt;p&gt;mongos&amp;gt; c = db.test.find(&lt;/p&gt;
{title: &quot;shay&quot;}
&lt;p&gt;,&lt;/p&gt;
{f:0}
&lt;p&gt;).sort(&lt;/p&gt;
{&quot;f&quot;:1}
&lt;p&gt;)&lt;br/&gt;
error: {&lt;br/&gt;
        &quot;$err&quot; : &quot;have to have sort key in projection and removing it&quot;,&lt;br/&gt;
        &quot;code&quot; : 13431&lt;br/&gt;
}&lt;/p&gt;</customfieldvalue>

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